The 36IB0503XT-1WR2 from Ideal Power Ltd is a DC to DC Converter with Input Voltage 4.75 to 5.25 V, Output Voltage 1 3.3 V, Output Current 1 25 to 243 mA, Output Power 1000 mW, Isolation Voltage 1500 V. Tags: Surface Mount, Buck/Step down. More details for 36IB0503XT-1WR2 can be seen below.